#include "sysdep1.h"    /* here to get stat64 on some badly designed Linux systems */
#include "v3p_f2c.h"
#ifdef KR_headers
extern char *malloc();
#else
#undef abs
#undef min
#undef max
#include "stdlib.h"
#endif
#include "fio.h"
#include "fmt.h"        /* for struct syl */
#ifdef __cplusplus
extern "C" {
#endif

/*global definitions*/
unit f__units[MXUNIT];  /*unit table*/
flag f__init;   /*0 on entry, 1 after initializations*/
cilist *f__elist;       /*active external io list*/
icilist *f__svic;       /*active internal io list*/
flag f__reading;        /*1 if reading, 0 if writing*/
flag f__cplus,f__cblank;
char *f__fmtbuf;
flag f__external;       /*1 if external io, 0 if internal */
#ifdef KR_headers
int (*f__doed)(),(*f__doned)();
int (*f__doend)(),(*f__donewrec)(),(*f__dorevert)();
int (*f__getn)();       /* for formatted input */
void (*f__putn)();      /* for formatted output */
#else
int (*f__getn)(void);   /* for formatted input */
void (*f__putn)(int);   /* for formatted output */
int (*f__doed)(struct syl*, char*, ftnlen),(*f__doned)(struct syl*);
int (*f__dorevert)(void),(*f__donewrec)(void),(*f__doend)(void);
#endif
flag f__sequential;     /*1 if sequential io, 0 if direct*/
flag f__formatted;      /*1 if formatted io, 0 if unformatted*/
FILE *f__cf;    /*current file*/
unit *f__curunit;       /*current unit*/
int f__recpos;  /*place in current record*/
OFF_T f__cursor, f__hiwater;
int f__scale;
char *f__icptr;

/*error messages*/
char *F_err[] =
{
        "error in format",                              /* 100 */
        "illegal unit number",                          /* 101 */
        "formatted io not allowed",                     /* 102 */
        "unformatted io not allowed",                   /* 103 */
        "direct io not allowed",                        /* 104 */
        "sequential io not allowed",                    /* 105 */
        "can't backspace file",                         /* 106 */
        "null file name",                               /* 107 */
        "can't stat file",                              /* 108 */
        "unit not connected",                           /* 109 */
        "off end of record",                            /* 110 */
        "truncation failed in endfile",                 /* 111 */
        "incomprehensible list input",                  /* 112 */
        "out of free space",                            /* 113 */
        "unit not connected",                           /* 114 */
        "read unexpected character",                    /* 115 */
        "bad logical input field",                      /* 116 */
        "bad variable type",                            /* 117 */
        "bad namelist name",                            /* 118 */
        "variable not in namelist",                     /* 119 */
        "no end record",                                /* 120 */
        "variable count incorrect",                     /* 121 */
        "subscript for scalar variable",                /* 122 */
        "invalid array section",                        /* 123 */
        "substring out of bounds",                      /* 124 */
        "subscript out of bounds",                      /* 125 */
        "can't read file",                              /* 126 */
        "can't write file",                             /* 127 */
        "'new' file exists",                            /* 128 */
        "can't append to file",                         /* 129 */
        "non-positive record number",                   /* 130 */
        "nmLbuf overflow"                               /* 131 */
};
#define MAXERR (sizeof(F_err)/sizeof(char *)+100)

 int
#ifdef KR_headers
f__canseek(f) FILE *f; /*SYSDEP*/
#else
f__canseek(FILE *f) /*SYSDEP*/
#endif
{
#ifdef NON_UNIX_STDIO
        return !isatty(fileno(f));
#else
        struct STAT_ST x;

        if (FSTAT(fileno(f),&x) < 0)
                return(0);
#ifdef S_IFMT
        switch(x.st_mode & S_IFMT) {
        case S_IFDIR:
        case S_IFREG:
                if(x.st_nlink > 0)      /* !pipe */
                        return(1);
                else
                        return(0);
        case S_IFCHR:
                if(isatty(fileno(f)))
                        return(0);
                return(1);
#ifdef S_IFBLK
        case S_IFBLK:
                return(1);
#endif
        }
#else
#ifdef S_ISDIR
        /* POSIX version */
        if (S_ISREG(x.st_mode) || S_ISDIR(x.st_mode)) {
                if(x.st_nlink > 0)      /* !pipe */
                        return(1);
                else
                        return(0);
                }
        if (S_ISCHR(x.st_mode)) {
                if(isatty(fileno(f)))
                        return(0);
                return(1);
                }
        if (S_ISBLK(x.st_mode))
                return(1);
#else
        Help! How does fstat work on this system?
#endif
#endif
        return(0);      /* who knows what it is? */
#endif
}

 void
#ifdef KR_headers
f__fatal(n,s) char *s;
#else
f__fatal(int n, char *s)
#endif
{
        if(n<100 && n>=0) perror(s); /*SYSDEP*/
        else if(n >= (int)MAXERR || n < -1)
        {       fprintf(stderr,"%s: illegal error number %d\n",s,n);
        }
        else if(n == -1) fprintf(stderr,"%s: end of file\n",s);
        else
                fprintf(stderr,"%s: %s\n",s,F_err[n-100]);
        if (f__curunit) {
                fprintf(stderr,"apparent state: unit %d ",
                        (int)(f__curunit-f__units));
                fprintf(stderr, f__curunit->ufnm ? "named %s\n" : "(unnamed)\n",
                        f__curunit->ufnm);
                }
        else
                fprintf(stderr,"apparent state: internal I/O\n");
        if (f__fmtbuf)
                fprintf(stderr,"last format: %s\n",f__fmtbuf);
        fprintf(stderr,"lately %s %s %s %s",f__reading?"reading":"writing",
                f__sequential?"sequential":"direct",f__formatted?"formatted":"unformatted",
                f__external?"external":"internal");
        sig_die(" IO", 1);
}
/*initialization routine*/
 VOID
f_init(Void)
{       unit *p;

        f__init=1;
        p= &f__units[0];
        p->ufd=stderr;
        p->useek=f__canseek(stderr);
        p->ufmt=1;
        p->uwrt=1;
        p = &f__units[5];
        p->ufd=stdin;
        p->useek=f__canseek(stdin);
        p->ufmt=1;
        p->uwrt=0;
        p= &f__units[6];
        p->ufd=stdout;
        p->useek=f__canseek(stdout);
        p->ufmt=1;
        p->uwrt=1;
}

 int
#ifdef KR_headers
f__nowreading(x) unit *x;
#else
f__nowreading(unit *x)
#endif
{
        OFF_T loc;
        int ufmt, urw;
        extern char *f__r_mode[], *f__w_mode[];

        if (x->urw & 1)
                goto done;
        if (!x->ufnm)
                goto cantread;
        ufmt = x->url ? 0 : x->ufmt;
        loc = FTELL(x->ufd);
        urw = 3;
        if (!FREOPEN(x->ufnm, f__w_mode[ufmt|2], x->ufd)) {
                urw = 1;
                if(!FREOPEN(x->ufnm, f__r_mode[ufmt], x->ufd)) {
 cantread:
                        errno = 126;
                        return 1;
                        }
                }
        FSEEK(x->ufd,loc,SEEK_SET);
        x->urw = urw;
 done:
        x->uwrt = 0;
        return 0;
}

 int
#ifdef KR_headers
f__nowwriting(x) unit *x;
#else
f__nowwriting(unit *x)
#endif
{
        OFF_T loc;
        int ufmt;
        extern char *f__w_mode[];

        if (x->urw & 2) {
                if (x->urw & 1)
                        FSEEK(x->ufd, (OFF_T)0, SEEK_CUR);
                goto done;
                }
        if (!x->ufnm)
                goto cantwrite;
        ufmt = x->url ? 0 : x->ufmt;
        if (x->uwrt == 3) { /* just did write, rewind */
                if (!(f__cf = x->ufd =
                                FREOPEN(x->ufnm,f__w_mode[ufmt],x->ufd)))
                        goto cantwrite;
                x->urw = 2;
                }
        else {
                loc=FTELL(x->ufd);
                if (!(f__cf = x->ufd =
                        FREOPEN(x->ufnm, f__w_mode[ufmt | 2], x->ufd)))
                        {
                        x->ufd = NULL;
 cantwrite:
                        errno = 127;
                        return(1);
                        }
                x->urw = 3;
                FSEEK(x->ufd,loc,SEEK_SET);
                }
 done:
        x->uwrt = 1;
        return 0;
}

 int
#ifdef KR_headers
err__fl(f, m, s) int f, m; char *s;
#else
err__fl(int f, int m, char *s)
#endif
{
        if (!f)
                f__fatal(m, s);
        if (f__doend)
                (*f__doend)();
        return errno = m;
        }
#ifdef __cplusplus
}
#endif
